Dolby Laboratories DP569 Manual De Usuario

Model DP569 User’s Manual 

Applications 

3-4 

The DP569 has a bypass input that can be used for redundant or hot standby 
operation. In order to connect a pair of DP569 for hot standby, the following 
connections should be made. 

Main Program

Output

Main Program

Audio

Optional Terminator

Not Connected

Bypass In

Bypass In

Switched

Out

Not Used

Main 

Out

Main 

Out

Digital

In

Digital

In

Switched

Out

Normal

Bypass

Dolby Digital

Encode Processing

Dolby Digital

Encode Processing

Figure 3-3 Hot-Standby Operation of the DP569 

The unit automatically enters Bypass mode when an internal fault occurs or when 
power to one unit is lost. Bypass mode can also be selected from the I/O Control 
menu or via the GPI/O input port. 

For further security, pins 1 and 9 (ground) of the GPI/O ports can be used to control a 
unit fault alert. If pin 1 goes “low,” then a power supply or hardware fault has 
occurred. These can be used on both the encoders so that a faulty standby encoder can 
be identified before it is required. Pins 3, 4, and 9 can also be used to ascertain 
whether the unit is producing an encoded output, and to trigger a warning.  

This section describes the steps necessary to configure the DP569 for typical operation. 

1.  After unpacking the unit, connect the Digital Audio Inputs to the DP569 using 

termination as required. See Section 2.2.2, Digital Audio Inputs.